Lepidoptera (/ Ë l É p Éª Ë d É p t Ér É / lep-i-DOP-tÉr-É) is an order of insects that includes butterflies and moths (both are called lepidopterans). About 180,000 species of the Lepidoptera are described, in 126 families and 46 superfamilies, 10% of the total described species of living organisms.
Skin Tension Lines and how to get it. 1  Skin Tension Lines (STLs) are series of lines based on the direction of tension as this relaxed skin tension lines run perpendicular to the underlying muscles contraction. For best results and aesthetic outcome, place skin incisions along skin tension lines.
Tension Headache. Pain in the back of the head may affect the muscles when neck and head tighten. The possible cause of the headache is stress. The fluctuating levels of neurotransmitters can contribute to the headache.Often, the pain begins at the back of the head.his kind of back of head pain, characterized as secondary headaches, are caused by neck problems. It can be felt when the spinal joints located in neck are irritated, or when the muscles of the neck are strained. Bad posture, cervical abnormalities and stress could be contributing factors.